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WO2025035798A1 - Élément de batterie, batterie et dispositif électrique - Google Patents

Élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2025035798A1
WO2025035798A1 PCT/CN2024/086673 CN2024086673W WO2025035798A1 WO 2025035798 A1 WO2025035798 A1 WO 2025035798A1 CN 2024086673 W CN2024086673 W CN 2024086673W WO 2025035798 A1 WO2025035798 A1 WO 2025035798A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
battery cell
support structure
cell according
electrode assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/086673
Other languages
English (en)
Chinese (zh)
Inventor
杨道伟
柯海波
阎晓洁
李全坤
邢承友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2025035798A1 publication Critical patent/WO2025035798A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
    • H01M50/367—Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device.
  • the electrode assembly runs the risk of moving toward the first wall of the outer shell on which a pressure relief mechanism is provided, causing the electrode assembly to be pressed against the first wall, thereby blocking the channel for the thermal runaway gas to be discharged from the pressure relief mechanism, thereby causing non-directional pressure relief inside the battery cell.
  • the embodiments of the present application provide a battery cell, a battery, and an electrical device, which can reduce the possibility of non-directional pressure release in the battery cell.
  • a battery cell comprising: an outer shell having a first wall, the first wall being provided with a pressure relief mechanism; an electrode assembly accommodated in the outer shell; a support structure, arranged between the electrode assembly and the first wall and fixedly connected to the first wall, the support structure being used to form an exhaust channel between the first wall and the electrode assembly that is connected to the pressure relief mechanism.
  • a support structure is provided between a first wall provided with a pressure relief mechanism and the electrode assembly, and the support structure is fixed on the first wall to form an exhaust passage connected to the pressure relief mechanism between the first wall and the electrode assembly.
  • the support structure is used to support the electrode assembly.
  • the support structure is used to support the electrode assembly, which is beneficial for forming an exhaust channel connected to the pressure relief mechanism between the first wall and the electrode assembly when thermal runaway occurs in the battery cell, thereby improving the problem of non-directional pressure relief in the battery cell.
  • the melting point of the support structure is greater than 100°C.
  • a support structure with a melting point greater than 100°C is used, which is advantageous in that the battery cell is not easily melted when thermal runaway occurs, thereby being able to form an exhaust channel connected to the pressure relief mechanism between the first wall and the electrode assembly, so that the thermal runaway gas can be discharged to the outside of the battery cell through the pressure relief mechanism in a timely manner, thereby improving the problem of non-directional pressure relief of the battery cell.
  • the battery cell further includes: an insulating member disposed between the electrode assembly and the first wall; wherein the insulating member is provided with an escape cavity, and the escape cavity is used to accommodate the support structure.
  • the insulation between the first wall and the electrode assembly does not need to be affected, and there is no need to occupy additional space of the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.
  • the battery cell further includes an insulating member, the insulating member is used to insulate the first wall and the electrode assembly, and the melting point of the supporting structure is higher than the melting point of the insulating member.
  • the support structure is not easily melted in the later stage of thermal runaway, and an exhaust channel can be provided for the thermal runaway gas to reach the pressure relief mechanism, thereby reducing the probability of non-directional pressure relief of the battery cell.
  • the support structure is fixedly connected to the first wall by welding.
  • the support structure and the first wall are fixedly connected by welding, so as to enhance the bonding strength between the support structure and the first wall.
  • the support structure and the first wall are integrally formed.
  • the support structure and the first wall are integrally formed, which can improve the bonding strength between the first wall and the support structure, thereby reducing the shaking of the support structure in the battery cell and reducing the probability of the support structure blocking the pressure relief mechanism.
  • an insulating layer is provided on a surface of the support structure facing the electrode assembly.
  • an insulating layer is provided on the surface of the support structure facing the electrode assembly, which can reduce the probability of electrical connection between the first wall and the electrode assembly.
  • the material of the support structure is the same as the material of the first wall.
  • the material of the support structure is set to be the same as the material of the first wall, which can improve the workability of fixing the support structure on the first wall.
  • a gap between the shell and the electrode assembly there is a gap between the shell and the electrode assembly; the support structure is provided with a cavity penetrating along the first direction, the cavity is used to conduct the pressure relief mechanism and the gap, and the first direction is perpendicular to the thickness direction of the first wall.
  • the support structure is provided with a cavity penetrating along the first direction, which is used to connect the gap and the pressure relief mechanism, so as to guide the thermal runaway gas accumulated in the gap to the pressure relief mechanism, thereby reducing the possibility that the thermal runaway gas accumulated in the gap will not be exhausted in time and cause the shell to be broken.
  • the cavity in the support structure it can also achieve the effect of reducing weight and improving energy density.
  • the support structure includes a first connecting wall and at least one supporting wall that are connected to each other, the first connecting wall is fixedly connected to the first wall, and the supporting wall is perpendicular to the first connecting wall.
  • the weight of the battery cell can be reduced and the energy density of the battery cell can be improved.
  • the at least one supporting wall includes two supporting walls arranged opposite to each other along a second direction, the second direction is perpendicular to a thickness direction of the first wall, and the second direction is perpendicular to the first direction.
  • a cavity penetrating along the first direction is formed by two supporting walls arranged opposite to each other along the second direction and the first connecting wall, so that the ventilation cross-sectional area can be increased as much as possible while the supporting strength is enhanced, thereby improving the exhaust rate of the thermal runaway gas.
  • the two support walls are respectively connected to the two ends of the first connecting wall along the second direction
  • the support wall includes a first part perpendicular to the second direction and a second part parallel to the first connecting wall, the first part is connected to the first connecting wall, and the two second parts of the two support walls are spaced apart along the second direction.
  • the supporting wall includes not only a first portion perpendicular to the second direction, but also a second portion parallel to the first connecting wall, and the two second portions of the supporting structure are spaced apart along the second direction, which can enhance the strength of the supporting structure.
  • a projection of the second part on the first wall is located within a projection of the first connecting wall on the first wall.
  • the two supporting walls are respectively connected to the two ends of the first connecting wall along the second direction, and in the thickness direction of the first wall, the projection of the second part on the first wall is located at the first connecting wall at Within the projection on the first wall, the ventilation cross-sectional area of the supporting structure can be more effectively increased.
  • a projection of the second part on the first wall is located outside a projection of the first connecting wall on the first wall.
  • the two supporting walls are respectively connected to the two ends of the first connecting wall along the second direction, and in the thickness direction of the first wall, the projection of the second part on the first wall is located outside the projection of the first connecting wall on the first wall, so that the supporting structure is more manufacturable.
  • the support structure further includes a second connecting wall, which is arranged opposite to the first connecting wall along the thickness direction of the first wall, and the first connecting wall, the second connecting wall and the two supporting walls are connected end to end to form a cavity.
  • the support structure is formed by a first connecting wall, two supporting walls and a second connecting wall connected end to end, which can enhance the strength of the support structure and thus improve the support for the electrode assembly.
  • the support structure is disposed at an end region of the battery cell along the first direction.
  • the support structure is arranged at the end area of the first wall along the first direction, which can minimize the possibility of the first wall at the end in the first direction abutting against the electrode assembly, so that the thermal runaway gas in the battery cell can reach the pressure relief mechanism, reducing the possibility of non-directional pressure relief in the battery cell.
  • the pressure relief mechanism in a first direction, is disposed between two supporting structures, and the first direction is perpendicular to a thickness direction of the first wall.
  • the pressure relief mechanism in the first direction, is arranged between the two supporting structures, which can minimize the possibility of the end of the first wall abutting against the electrode assembly, so that the thermal runaway gas in the two side chamber cavities of the battery cell in the first direction can be discharged to the pressure relief mechanism through the corresponding supporting structures, further reducing the possibility of non-directional pressure relief of the battery cell.
  • the support structure is disposed in a middle region of the end region in a second direction, the second direction is perpendicular to a thickness direction of the first wall, and the second direction is perpendicular to the first direction.
  • the thermal runaway gas accumulated in the side chamber cavity of the battery cell in the first direction can be discharged to the pressure relief mechanism as much as possible, thereby reducing the possibility of non-directional pressure relief of the battery cell.
  • the support structure is disposed in an edge region of the end region in a second direction, the second direction is perpendicular to a thickness direction of the first wall, and the second direction is perpendicular to the first direction.
  • the thermal runaway gas accumulated in the side chamber cavity of the battery cell in the first direction can be discharged to the pressure relief mechanism as much as possible without serious deformation of the shell, thereby reducing the possibility of non-directional pressure relief of the battery cell.
  • a dimension h of the support structure and a dimension c of the battery cell satisfy: 0.003 ⁇ h/c ⁇ 0.13.
  • h/c is less than 0.003, it is very easy to be blocked by particulate matter or pole pieces generated by the loss of control inside the battery cell, thereby failing to achieve the purpose of forming an exhaust channel; and when h/c is greater than 0.13, the energy density of the battery cell will be seriously sacrificed; setting h/c between 0.003 and 0.13 can achieve the purpose of balancing the energy density of the battery cell and forming an exhaust channel between the first wall and the electrode assembly.
  • the first wall and the electrode assembly are provided with at least one supporting structure, and in the thickness direction of the first wall, the at least one supporting structure satisfies the following relationship between the total projected area S1 of the first wall and the area S of the first wall: 0.012 ⁇ S1/S ⁇ 0.26.
  • the first wall is an end cover.
  • the support structure and the end cover are fixed together.
  • the support structure and the end cover can be fixed together externally, or the support structure can be directly formed when preparing the end cover, without extending the support structure into the shell for fixing, thereby improving the preparation efficiency of the battery cell.
  • the battery cell further includes: an electrode terminal disposed on the first wall; and the electrode terminal is electrically connected to the electrode assembly.
  • a battery comprising the battery cell in the first aspect and any possible implementation manner of the first aspect.
  • an electrical device comprising the battery in the second aspect, wherein the battery is used to provide electrical energy to the electrical device.
  • FIG. 1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the structure of a battery disclosed in an embodiment of the present application.
  • FIG. 3 is an exploded schematic diagram of a battery cell disclosed in an embodiment of the present application.
  • FIG. 4 is a planar cross-sectional view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 5 is a partial cross-sectional view of a battery cell disclosed in yet another embodiment of the present application.
  • FIG. 6 is a schematic diagram of the connection between the first wall and the support structure disclosed in an embodiment of the present application.
  • FIG. 7 is another planar cross-sectional view of a battery cell disclosed in an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a support structure disclosed in an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a support structure disclosed in another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a support structure disclosed in yet another embodiment of the present application.
  • FIG. 11 shows a top view of a first wall disclosed in an embodiment of the present application.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups)
  • multiple sheets refers to more than two sheets (including two sheets).
  • the battery cell may be a secondary battery.
  • a secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.
  • the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.
  • a battery cell generally includes an electrode assembly.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator.
  • active ions such as lithium ions
  • the separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.
  • the positive electrode may be a positive electrode sheet, which may include a positive current collector.
  • the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.
  • the positive electrode current collector may be a metal foil or a composite current collector.
  • the metal foil aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used.
  • the composite current collector may include a polymer material base and a metal layer.
  • the composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
  • the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds.
  • the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.
  • lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.
  • lithium iron phosphate such as LiFePO4 (also referred to as LFP)
  • LiMnPO4 lithium manganese phosphate
  • the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
  • the negative electrode current collector may be a metal foil or a composite current collector.
  • the metal foil aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.
  • the composite current collector may include a polymer material base and a metal layer.
  • the composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
  • the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.
  • the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.
  • the negative electrode active material may adopt the negative electrode active material for battery cells known in the art.
  • the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.
  • the negative electrode may be a foam metal.
  • the foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc.
  • the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.
  • a lithium source material, potassium metal or sodium metal may be filled or/and deposited in the negative electrode current collector, and the lithium source material is lithium metal and/or lithium-rich material.
  • the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.
  • the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.
  • the separator is a separator.
  • the present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.
  • the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.
  • the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.
  • the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes.
  • an electrolyte which acts as a conductor of ions between the positive and negative electrodes.
  • the present application has no specific restrictions on the type of electrolyte, which can be selected according to needs.
  • the electrolyte can be liquid, gel or solid.
  • the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.
  • the electrode assembly is a laminate structure.
  • a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.
  • a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.
  • both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.
  • a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.
  • the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.
  • the shape of the electrode assembly can be cylindrical, flat, or polygonal.
  • the electrode assembly is provided with tabs, which can lead current out of the electrode assembly.
  • the tabs include a positive tab and a negative tab.
  • the battery cell may include a housing.
  • the housing is used to encapsulate components such as electrode assemblies and electrolytes.
  • the housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.
  • the housing includes a shell and a cover plate.
  • the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes.
  • the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.
  • the battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity.
  • the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.
  • the battery may be a battery module.
  • the multiple battery cells are arranged and fixed to form a battery module.
  • the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.
  • the box body can be used as a part of the chassis structure of the vehicle.
  • part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
  • an embodiment of the present application provides a battery cell, which provides a support structure between a first wall provided with a pressure relief mechanism and an electrode assembly, and fixes the support structure on the first wall, so that the support structure can form an exhaust channel between the first wall and the electrode assembly to guide the thermal runaway gas to the pressure relief mechanism, and then the thermal runaway gas can be discharged to the outside of the battery cell through the pressure relief mechanism in time, thereby reducing the possibility of non-directional pressure relief in the battery cell.
  • FIG1 it is a schematic diagram of the structure of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle.
  • the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a motor 80, a controller 60 and a battery 100 may be provided inside the vehicle 1.
  • the controller 60 is used to control the battery 100 to supply power to the motor 80.
  • a battery 100 may be provided at the bottom, front or rear of the vehicle 1.
  • the battery 100 may be used to supply power to the vehicle 1.
  • the battery 100 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1.
  • the battery 100 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
  • the battery 100 may include a plurality of battery cells 20.
  • the battery 100 may also include a casing, the interior of which is a hollow structure, and a plurality of battery cells 20 may be accommodated in the casing.
  • the casing may include two parts, which are respectively referred to as a first casing portion 111 and a second casing portion 112, and the first casing portion 111 and the second casing portion 112 are buckled together.
  • the shapes of the first casing portion 111 and the second casing portion 112 may be determined according to the shapes of the combination of the plurality of battery cells 20, and at least one of the first casing portion 111 and the second casing portion 112 has an opening.
  • only one of the first casing portion 111 and the second casing portion 112 is a hollow cuboid with an opening, and the other is in the shape of a plate to cover the opening.
  • the second casing portion 112 is a hollow cuboid with only one face.
  • the first box body 111 is a plate-shaped opening surface, and the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. After the multiple battery cells 20 are connected in parallel, in series or in mixed series, they are placed in the box body formed by the first box body 111 and the second box body 112 being buckled together.
  • the first box body 111 and the second box body 112 can both be hollow cuboids and each have only one open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box with a closed chamber.
  • a plurality of battery cells 20 are connected in parallel, in series, or in a mixed combination and are placed in the box formed by the first box body 111 and the second box body 112 being buckled together.
  • the battery 100 may also include other structures, which are not described one by one here.
  • the battery 100 may also include a busbar component (not shown in the figure), which is used to realize the electrical connection between multiple battery cells 20.
  • the busbar component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20.
  • the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box through the conductive mechanism.
  • the conductive mechanism may also belong to the busbar component.
  • the number of battery cells 20 can be multiple, and multiple battery cells can be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.
  • Battery 100 can also be called a battery pack.
  • multiple battery cells can be connected in series, in parallel, or in hybrid connection to form a battery module, and multiple battery modules can be connected in series, in parallel, or in hybrid connection to form battery 100.
  • multiple battery cells can directly form battery 100, or they can first form battery modules, and then the battery modules can form battery 100.
  • FIG. 3 shows a schematic exploded view of a battery cell 20 according to an embodiment of the present application.
  • the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212, wherein the wall of the shell 211 and the cover plate 212 are both referred to as the wall of the battery cell 20.
  • the shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined.
  • the shell 211 may be a hollow cuboid or cube or cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211.
  • the shell 211 when the shell 211 is a hollow cuboid or cube, one of the planes of the shell 211 is an open face, that is, the plane has no wall, so that the inside and outside of the shell 211 are connected.
  • the shell 211 may be a hollow cylinder, the end face of the shell 211 is an open face, that is, the end face has no wall, so that the inside and outside of the shell 211 are connected.
  • the cover plate 212 covers The cover is opened and connected to the housing 211 to form a closed cavity for placing the electrode assembly 22.
  • the housing 211 is filled with electrolyte, such as electrolyte solution.
  • the battery cell 20 also includes two electrode terminals 214.
  • the cover plate 212 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212.
  • the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b.
  • Each electrode terminal 214 is provided with a corresponding connection member 23, or it can also be called a current collecting member, which is located between the cover plate 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.
  • each electrode assembly 22 has a first pole tab 221a and a second pole tab 222a.
  • the polarities of the first pole tab 221a and the second pole tab 222a are opposite.
  • the first pole tab 221a is a positive pole tab
  • the second pole tab 222a is a negative pole tab.
  • the first pole tab 221a of one or more electrode assemblies 22 is connected to an electrode terminal 214 through a connecting member 23, and the second pole tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal 214 through another connecting member 23.
  • the first pole tab 221a is a positive pole tab
  • the second pole tab 222a is a negative pole tab
  • the positive electrode terminal 214a is connected to the first pole tab 221a through a connecting member 23
  • the negative electrode terminal 214b is connected to the second pole tab 222a through another connecting member 23.
  • the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. As shown in FIG. 3 , four independent electrode assemblies 22 are provided in the battery cell 20 .
  • a pressure relief mechanism 213 may be further provided on one wall of the battery cell 20.
  • the pressure relief mechanism 213 is used to be actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.
  • the pressure relief mechanism 213 may be disposed on the cover plate 212 , or on any wall of the housing 211 .
  • FIG. 4 shows a plan cross-sectional view of a battery cell 30 according to an embodiment of the present application.
  • the battery cell 30 includes: a shell 31, having a first wall 311, and a pressure relief mechanism 312 is arranged on the first wall 311; an electrode assembly 32 is accommodated in the shell 31; a support structure 33, which is arranged between the first wall 311 and the electrode assembly 32, and the support structure 33 is fixedly connected to the first wall 311, and the support structure 33 is used to form an exhaust channel A between the first wall 311 and the electrode assembly 32 that is connected to the pressure relief mechanism 312.
  • the housing 31 may include the shell 211 and the cover 212 shown in FIG. 3
  • the first wall 311 may be any wall of the shell 211 or the cover 212
  • the pressure relief mechanism 213 may be disposed on any wall of the battery cell 30 .
  • the support structure 33 is arranged between the first wall 311 and the electrode assembly 32, and the support structure 33 is fixedly connected to the first wall 322. It can be understood that the support structure 33 is fixed on the surface of the first wall 311 facing the electrode assembly 32. For example, as shown in Figure 4, the support structure 33 is fixed on the lower surface of the first wall 311.
  • the support structure 33 is used to form an exhaust channel A between the first wall 311 and the electrode assembly 32, which is connected to the pressure relief mechanism 312. Specifically, when thermal runaway occurs in the battery cell 30, the support structure 33 can separate the first wall 311 and the electrode assembly 32, and form an exhaust channel A between the first wall 311 and the electrode assembly 32.
  • the exhaust channel A can guide the thermal runaway gas to the pressure relief mechanism 312, so that the thermal runaway gas is discharged from the pressure relief mechanism 312 to the outside of the battery cell 30.
  • the support structure 33 is arranged between the first wall 311 and the electrode assembly 32, and the support structure 33 is fixed to the first wall 311, and is used to form an exhaust channel A between the first wall 311 and the electrode assembly 32 that is connected to the pressure relief mechanism 312, so that when the battery cell 30 has thermal runaway, there is a gap between the first wall 311 and the electrode assembly 32, so that the thermal runaway gas can be accommodated, and because the pressure relief mechanism 312 is arranged on the first wall 311, the thermal runaway gas accumulated in the gap between the first wall 311 and the electrode assembly 32 can be discharged from the pressure relief mechanism 312 to the outside of the battery cell 30, thereby reducing the possibility of non-directional pressure relief of the battery cell 30.
  • the support structure 33 is used to support the electrode assembly 32 .
  • the support structure 33 may restrict the electrode assembly 32 from moving toward the first wall 311 .
  • the support structure 33 is used to support the electrode assembly 32 when the battery cell 30 has thermal runaway.
  • the support structure 33 can support the electrode assembly 32 regardless of whether the battery cell 30 has thermal runaway. The embodiment of the present application is not limited to this.
  • the support structure 33 is used to support the electrode assembly 32, which is beneficial for forming an exhaust channel A connected to the pressure relief mechanism 312 between the first wall 311 and the electrode assembly 32 when thermal runaway occurs in the battery cell 30, thereby improving the problem of non-directional pressure relief of the battery cell 30.
  • the melting point of the support structure 33 is greater than 100°C.
  • the material of the support structure 33 may be a single material, for example, the material of the support structure 33 is a single material such as aluminum material or copper material. In this case, the support structure 33 has a fixed melting point.
  • the material of the support structure 33 may be a composite material.
  • the support structure 33 may be a mixed material of aluminum and copper.
  • the support structure 33 does not have a fixed melting point, that is, the melting point of the support structure 33 is the melting point range of various materials.
  • the melting point of aluminum material is 660°C
  • the melting point of copper is 1083°C
  • the melting point range of the support structure 33 is 660°C to 1083°C
  • the melting point of the support structure 33 is higher than the melting point of the insulating member 34. It can be understood that the lowest melting point in the melting point range of the support structure 33 is higher than the melting point of the insulating member 34.
  • the melting point of the support structure 33 can be greater than 150°C, so that the thermal runaway gas can smoothly reach the pressure relief mechanism 312 before the pressure relief mechanism 312 opens the valve. Further optionally, the melting point of the support structure 33 is greater than 500°C, so that the battery cell 30 can still maintain mechanical strength during the thermal runaway process.
  • the compound with an olivine structure can be selected from lithium iron phosphate, lithium iron manganese phosphate, or a mixture of lithium iron phosphate and lithium iron manganese phosphate.
  • the melting point of the support structure 33 can be greater than 100°C, so that the thermal runaway gas can smoothly reach the pressure relief mechanism 312 before the pressure relief mechanism 312 opens the valve. Further optionally, the melting point of the support structure 33 is greater than 400°C, so that the battery cell 30 can still maintain mechanical strength during thermal runaway.
  • the layered compound can be selected from lithium nickel cobalt manganese oxygen ternary layered materials, or a mixture of lithium iron phosphate and lithium nickel cobalt manganese oxygen ternary layered materials, or a mixture of lithium manganese iron and lithium nickel cobalt manganese oxygen ternary layered materials.
  • the material of the support structure 33 may be a high temperature resistant material.
  • the material of the support structure 33 may include at least one hard material selected from metal, graphite, polytetrafluoroethylene, mica, ceramics and the like.
  • a support structure 33 with a melting point greater than 100°C is used, which is advantageous in that the battery cell 30 is not easily melted when thermal runaway occurs, thereby being able to form an exhaust channel A connected to the pressure relief mechanism 312 between the first wall 311 and the electrode assembly 32, so that the thermal runaway gas can be discharged to the outside of the battery cell 30 through the pressure relief mechanism 312 in a timely manner, thereby improving the problem of non-directional pressure relief of the battery cell 30.
  • FIG5 shows a partial cross-sectional view of a battery cell 30 according to another embodiment of the present application.
  • the battery cell 30 further includes an insulating member 34 disposed between the electrode assembly 32 and the first wall 311 , wherein the insulating member 34 is provided with an escape cavity 341 for accommodating the support structure 33 .
  • the insulating member 34 is disposed between the first wall 311 and the electrode assembly 32 to insulate the first wall 311 and the electrode assembly 32.
  • the material of the insulating member 34 may include a polypropylene (PP) material, a polyphenylene sulfide (PPS) material, or a soluble polytetrafluoroethylene (PFA) material. wait.
  • PP polypropylene
  • PPS polyphenylene sulfide
  • PFA soluble polytetrafluoroethylene
  • the insulating member 34 may be provided with an escape cavity 341 opening toward the first wall 311 , so that the support structure 33 fixed to the surface of the first wall 311 facing the electrode assembly 32 may be accommodated in the escape cavity 341 .
  • the melting point of the support structure 33 is higher than the melting point of the insulating member 34 .
  • the insulating member 34 may be melted, which will cause the electrode assembly 32 to move toward the first wall 311, or even to abut against the first wall 311. This blocks the exhaust passage of the thermal runaway gas from reaching the pressure relief mechanism 312.
  • the support structure 33 is not easily melted in the later stage of thermal runaway, and can provide an exhaust passage A for the thermal runaway gas to reach the pressure relief mechanism 312, thereby reducing the probability of non-directional pressure relief of the battery cell 30.
  • the material of the support structure 33 is the same as that of the first wall 311 .
  • the support structure 33 may include a variety of materials, for example, its main structure is a metal material, and the outer surface is wrapped with an insulating material.
  • the first wall 311 may also include a variety of materials, for example, its main structure is a metal material, and the first wall 311 may also be provided with some components made of insulating materials.
  • the material of the support structure 33 in the embodiment of the present application is the same as the material of the first wall 311, which actually means that the material of the main structure of the support structure 33 is the same as the material of the main structure of the first wall 311.
  • the material of the main structure of the support structure 33 is the same as the material of the main structure of the first wall 311, and both are composite materials, it can be considered that the types of materials included in the two are the same, and the material ratios may be different.
  • the material of the first wall 311 is aluminum, and the material of the support structure 33 may also be aluminum.
  • the material of the support structure 33 is set to be the same as the material of the first wall 311 , which can improve the workability of fixing the support structure 33 on the first wall 311 .
  • the support structure 33 is made of metal material, and the support structure 33 and the first wall 311 can be fixedly connected by welding.
  • the support structure 33 and the first wall 311 are fixed by welding.
  • the connection can strengthen the bonding strength between the support structure 33 and the first wall 311 .
  • the support structure 33 and the first wall 311 may also be fixedly connected by riveting or other methods.
  • the material of the support structure 33 may be different from the material of the first wall 311.
  • the material of the support structure 33 may include at least one non-metallic material such as graphite material, polytetrafluoroethylene material, mica or ceramic.
  • the support structure 33 may be fixedly connected to the first wall 311 by bonding, clamping, etc.
  • the support structure 33 and the first wall 311 may also be integrally formed.
  • the support structure 33 and the first wall 311 are integrally formed, which can improve the bonding strength between the first wall 311 and the support structure 33, thereby reducing the shaking of the support structure 33 in the battery cell 30 and reducing the probability of the support structure 33 blocking the pressure relief mechanism 312.
  • FIG. 6 shows a schematic diagram of the connection between the first wall 311 and the support structure 33 according to an embodiment of the present application.
  • At least the surface of the support structure 33 facing the electrode assembly 32 is provided with an insulating layer 35 .
  • an insulating layer 35 needs to be provided on the surface of the support structure 33 ; and when the support structure 33 itself is made of insulating material, an insulating layer 35 does not need to be provided on the surface of the support structure 33 .
  • the insulating layer 35 can be set only on the surface of the support structure 33 facing the electrode assembly 32; and when the support structure 33 is made of metal material and is accommodated in the avoidance cavity 341 of the insulating component 34, and the avoidance cavity 341 does not penetrate the insulating component 34 in the thickness direction Z of the first wall 311, it is also not necessary to set the insulating layer 35 on the surface of the support structure 33.
  • the insulating layer 35 may be provided on all surfaces of the support structure 33 except the surface fixedly connected to the first wall 311 .
  • an independent insulating layer 35 may be wrapped on the surface of the support structure 33 .
  • a layer of insulating material may be coated on the surface of the support structure 33 to form the insulating layer 35 .
  • an insulating layer 35 is disposed on the surface of the support structure 33 facing the electrode assembly 32 , which can reduce the probability of electrical connection between the first wall 311 and the electrode assembly 32 .
  • the first direction there is a gap 36 between the housing 31 and the electrode assembly 32.
  • the support structure 33 is provided with a cavity 331 penetrating along the first direction, and the cavity 331 is used to conduct the gap 36 and the pressure relief mechanism 312, and the first direction is perpendicular to the thickness direction Z of the first wall 311.
  • the first direction may be a length direction X of the first wall 311 , or may be a width direction Y of the first wall 311 .
  • the support structure 33 may be disposed between the gap 36 and the pressure relief mechanism 312 .
  • the support structure 33 is provided with a cavity 331 that penetrates along the first direction, which is used to connect the gap 36 and the pressure relief mechanism 312, so as to guide the thermal runaway gas accumulated in the gap 36 to the pressure relief mechanism 312, thereby reducing the possibility that the thermal runaway gas accumulated in the gap 36 will not be exhausted in time and cause the shell 31 to be broken.
  • the cavity 331 in the support structure 33 it can also achieve the effect of reducing weight and improving energy density.
  • the support structure 33 may not have the cavity 331 , that is, the support structure 33 is a solid structure, as long as the support structure 33 can play a role in supporting the electrode assembly 32 when thermal runaway occurs in the battery cell 30 .
  • the support structure 33 may also be formed by a plurality of support blocks spaced apart along the second direction, wherein the space between every two adjacent support blocks may form the cavity 331 , that is, may play the role of the cavity 331 .
  • the first direction may be the length direction X of the first wall 311
  • the second direction may be the width direction Y of the first wall 311 ; or, the first direction may be the width direction Y of the first wall 311 , and the second direction may be the length direction of the first wall 311 .
  • Fig. 8 shows a schematic structural diagram of a support structure 33 according to an embodiment of the present application.
  • Fig. 9 shows a schematic structural diagram of a support structure 33 according to another embodiment of the present application.
  • Fig. 10 shows a schematic structural diagram of a support structure according to yet another embodiment of the present application.
  • the supporting structure 33 includes a first connecting wall 332 and at least one supporting wall 333 connected to each other, the first connecting wall 332 is parallel to the first wall 311 , and the first connecting wall 332 is fixedly connected to the first wall 311 , and the supporting wall 333 is perpendicular to the first connecting wall 332 .
  • the first connecting wall 332 fixedly connected to the first wall 311 is used.
  • the support structure 33 formed by at least one support wall 333 perpendicular to the first connection wall 332 can reduce the weight of the battery cell 30 and improve the energy density of the battery cell 30 .
  • the support wall 333 may be perpendicular to the first direction.
  • the support structure 33 includes a first connecting wall 332 and a support wall 333 .
  • the first connecting wall 332 and the support wall 333 may be L-shaped.
  • a through hole is provided in the support wall 333 to form a cavity 331 .
  • At least one supporting wall 333 includes two supporting walls 333 arranged opposite to each other along a second direction, the second direction is perpendicular to the thickness direction Z of the first wall 311 , and the second direction is perpendicular to the first direction.
  • two support walls 333 arranged opposite to each other along the second direction and the first connecting wall 332 form a cavity 331 that passes through along the first direction, which can increase the ventilation cross-sectional area as much as possible while enhancing the support strength, thereby improving the exhaust rate of the thermal runaway gas.
  • the two support walls 333 are respectively connected to the two ends of the first connecting wall 332 along the second direction, and the support wall 333 includes a first part 3331 perpendicular to the second direction and a second part 3332 parallel to the first connecting wall 332.
  • the first part 3331 is connected to the first connecting wall 332, and the two second parts 3332 of the two support walls 333 are spaced apart along the second direction.
  • the support wall 333 includes not only a first portion 3331 perpendicular to the second direction, but also a second portion 3332 parallel to the first connecting wall 332 , and the two second portions 3332 of the support structure 33 are spaced apart along the second direction, which can enhance the strength of the support structure 33 .
  • connection points between the two support walls 333 and the first connecting wall 332 may not be located at the two ends of the first connecting wall 332 along the second direction, that is, the connection points between the two support walls 333 and the first connecting wall 332 are respectively at a certain distance from the two ends of the first connecting wall 332 along the second direction.
  • the support wall 333 may include only the first portion 3331 , but not the second portion 3332 .
  • the projection of the second portion 3332 on the first wall 311 is located within the projection of the first connecting wall 332 on the first wall 311 .
  • the two support walls 333 are respectively connected to the two ends of the first connecting wall 332 along the second direction, and in the thickness direction Z of the first wall 311, the projection of the second part 3332 on the first wall 311 is located within the projection of the first connecting wall 332 on the first wall 311, which can more effectively increase the ventilation cross-sectional area of the support structure 33.
  • the second portion 3332 is The projection of the first wall 311 is located outside the projection of the first connecting wall 332 on the first wall 311 .
  • the two supporting walls 333 are respectively connected to the two ends of the first connecting wall 332 along the second direction, and in the thickness direction Z of the first wall 311, the projection of the second part 3332 on the first wall 311 is located outside the projection of the first connecting wall 332 on the first wall 311, so that the supporting structure 33 can be realized by bending, which has stronger manufacturability.
  • the support structure 33 further includes a second connecting wall 334 .
  • the first connecting wall 332 and the second connecting wall 334 are arranged opposite to each other along the thickness direction of the first wall 311 .
  • the first connecting wall 332 , the two supporting walls 333 and the second connecting wall 334 are connected end to end to form a cavity 331 .
  • first connecting wall 332 and the second connecting wall 334 are arranged opposite to each other along the thickness direction Z of the first wall 311, and the two supporting walls 333 are arranged opposite to each other along the second direction.
  • the first connecting wall 332, the two supporting walls 333 and the second connecting wall 334 are connected end to end to form a cavity 331 with a square cross-section.
  • the support structure 33 is formed by a first connecting wall 332 , two supporting walls 333 and a second connecting wall 334 connected end to end, which can enhance the support strength of the support structure 33 to the electrode assembly 32 .
  • the support structure 33 is disposed at an end region of the battery cell 30 along a first direction, and the first direction is perpendicular to a thickness direction Z of the first wall 311 .
  • the end of the first wall 311 is more likely to abut against the electrode assembly 32 than the middle region of the first wall 311.
  • Arranging the support structure 33 in the end region of the battery cell 30 along the first direction can minimize the possibility of the end of the first wall 311 in the first direction abutting against the electrode assembly 32, allowing the thermal runaway gas in the battery cell 30 to reach the pressure relief mechanism 312, thereby reducing the possibility of non-directional pressure relief in the battery cell 30.
  • the support structure 33 may be disposed at both ends of the first wall 311 along the length direction X and/or at both ends of the first wall 311 along the width direction Y.
  • the support structures 33 may be distributed at intervals at the ends of the first wall 311 along the circumference of the first wall 311 .
  • the pressure relief mechanism 312 is disposed between two support structures 33 .
  • the pressure relief mechanism 312 in the first direction, is disposed between the two support structures 33, which can reduce the possibility that the end of the first wall 311 abuts against the electrode assembly as much as possible.
  • the thermal runaway gas in the two side chambers of the battery cell 30 in the first direction can be discharged to the pressure relief mechanism 312 through the corresponding support structure 33 , further reducing the possibility of non-directional pressure relief of the battery cell 30 .
  • the support structure 33 is disposed in a middle region of the end region in the second direction.
  • the thermal runaway gas accumulated in the side chamber cavity of the battery cell 30 in the first direction can be discharged to the pressure relief mechanism 312 as much as possible, thereby reducing the possibility of non-directional pressure relief of the battery cell 30.
  • the support structure 33 is disposed in an edge region of the end region in the second direction.
  • the thermal runaway gas accumulated in the side chamber cavity of the battery cell 30 in the first direction can be discharged to the pressure relief mechanism 312 as much as possible without serious deformation of the outer shell 31, thereby reducing the possibility of non-directional pressure relief of the battery cell 30.
  • the support structure 33 may span the entire electrode assembly 32 in the second direction.
  • the support structure 33 may be disposed only at the four corners of the first wall 311 .
  • the dimension h of the support structure 33 and the dimension c of the battery cell satisfy: 0.003 ⁇ h/c ⁇ 0.13.
  • h/c is less than 0.003, it is very easy to be blocked by particulate matter or pole pieces generated by the loss of control inside the battery cell 30, thereby failing to achieve the purpose of forming the exhaust channel A; and when h/c is greater than 0.13, the energy density of the battery cell 30 will be seriously sacrificed; setting h/c between 0.003 and 0.13 can achieve the purpose of balancing the energy density of the battery cell 30 and forming the exhaust channel A between the first wall 311 and the electrode assembly 32.
  • the size of the battery cell shell is 44mm*220mm*100mm (width*length*height)
  • the energy density is 250Wh/kg
  • the end cover (for example, the first wall) with a support structure is manufactured by machine, and the end cover has a pressure relief mechanism, wherein the support structure is two regular quadrangular prisms, which are symmetrical.
  • the distribution is located at both ends of the short side of the end cap, with a length of 41mm, and the distance from the long side of the end cap is 0.5mm.
  • the distance from the support structure to the short side of the end cap is 7mm.
  • a plurality of support structures 33 are provided between the first wall 311 and the electrode assembly 32 , and in the thickness direction Z of the first wall 311 , the plurality of support structures 33 satisfy the following relationship between the total projected area S1 of the first wall 311 and the area S of the first wall: 0.012 ⁇ S1/S ⁇ 0.26.
  • the size of the battery cell shell is 44mm*220mm*100mm (width*length*height), the energy density is 250Wh/kg, and the end cap (e.g., the first wall) with a support structure is manufactured by machine forging.
  • the end cap has a pressure relief mechanism, wherein the support structure is two regular quadrangular prisms, which are symmetrically distributed and located at the two ends of the short side of the end cap, respectively, with a length of 41mm and a height of 1mm.
  • the width is used as a variable to regulate S1, and then the battery cell is triggered to lose control through the built-in heating film, and the directional pressure relief of the battery cell is observed.
  • the valve opening pressure of the pressure relief mechanism is 1.0MPa, and the end cap weld strength is 1.5MPa; at the same time, the air pressure inside the battery cell is detected through the end cap and the side air pipe, and the data is shown in Table 2.
  • the battery cell 30 further includes an electrode terminal 37 disposed at The first wall 311 and the electrode terminal 37 are electrically connected to the electrode assembly 32 .
  • the electrode terminal 37 may be disposed on a side of the first wall 311 away from the electrode assembly 32 , so as to reduce the internal space occupied by the battery cell 30 and improve the energy density of the battery cell 30 .
  • the battery cell 30 may be a square battery cell or a cylindrical battery cell.
  • the embodiment of the present application does not limit the shape of the battery cell 30 .
  • the battery cell 30 includes: a housing 31 having a first wall 311 on which an electrode terminal 37 and a pressure relief mechanism 312 are disposed; an electrode assembly 32 contained in the housing 31 , on which the electrode terminal 37 is disposed on a side of the first wall 311 away from the electrode assembly 32; a support structure 33 disposed between the electrode assembly 32 and the first wall 311 and fixedly connected to the first wall 311; an insulating member 34 disposed between the first wall 311 and the electrode assembly 32 , the insulating member 34 being provided with an escape cavity 341 , the escape cavity 341 being used to accommodate the support structure 33 , the melting point of the support structure 33 being higher than the melting point of the insulating member 34 and the support structure 33 being used to support the electrode assembly 32 when thermal runaway occurs in the battery cell 30 .
  • the first direction there is a gap 36 between the housing 31 and the electrode assembly 32 , the support structure 33 being provided with a cavity 331 penetrating along the first direction, the
  • a support structure 33 is provided between a first wall 311 provided with a pressure relief mechanism 312 and the electrode assembly 32, and the support structure 33 is fixed on the first wall 311, and the support structure 33 is provided with a cavity 331 which passes through along a first direction, so as to guide the thermal runaway gas accumulated in the gap 36 to the exhaust channel A and discharge it to the outside of the battery cell 30 through the pressure relief mechanism 312, thereby reducing the possibility of non-directional pressure relief of the battery cell 30.
  • the battery cell 30 may further include other components, such as the connecting member 23 shown in FIG. 3 , which will not be described in detail here for the sake of brevity.
  • the embodiment of the present application further provides a battery, which includes at least one battery cell 30 of the embodiment of the present application.
  • An embodiment of the present application further provides an electrical device, comprising the battery of the above embodiment, wherein the battery is used to provide electrical energy to the electrical device.
  • the electric device may be a vehicle as shown in FIG1 , or may be any device using a battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente demande concerne, selon des modes de réalisation, un élément de batterie, une batterie et un dispositif électrique. L'élément de batterie comprend : un boîtier présentant une première paroi pourvue d'un mécanisme de décompression ; un ensemble électrode, logé dans le boîtier ; et une structure de support, disposée entre l'ensemble électrode et la première paroi et reliée de manière fixe à la première paroi. La structure de support est utilisée pour former un canal d'échappement en communication avec le mécanisme de décompression entre la première paroi et l'ensemble électrode. Selon l'élément de batterie, la batterie et le dispositif électrique dans les modes de réalisation de la présente invention, la possibilité de relâchement de pression non directionnel de l'élément de batterie peut être réduite.
PCT/CN2024/086673 2023-08-16 2024-04-08 Élément de batterie, batterie et dispositif électrique Pending WO2025035798A1 (fr)

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KR20250134714A (ko) * 2021-07-29 2025-09-11 컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드 배터리 셀 및 그 제조방법과 제조 시스템, 배터리 및 전기장치

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WO2023050391A1 (fr) * 2021-09-30 2023-04-06 宁德时代新能源科技股份有限公司 Élément de batterie, batterie et appareil électrique
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